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CVE-2026-57216RabbitMQ: AMQP 1.0, AMQP 0-9-1, Stream Protocol loopback enforcement can lead to remote guest sessions due to listener-address loopback checks
RabbitMQ is a messaging and streaming broker. Prior to 3.13.15, 4.0.20, 4.1.11, and 4.2.6, AMQP 0-9-1, AMQP 1.0, and Stream Protocol authentication can allow a loopback-restricted user such as guest to connect remotely when traffic is accepted through a trusted PROXY-protocol path and the backend listener is loopback-bound because the loopback check uses the listener-side socket address instead of the real client source. This issue is fixed in versions 3.13.15, 4.0.20, 4.1.11, and 4.2.6.
10.0 CRITICALEPSS 0.50%Not in KEVNVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 10.0 | CRITICAL | 3.1NVD | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| 6.8 | MEDIUM | 3.1GitHub_M (CNA) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N |
Details
- CVE ID
- CVE-2026-57216
- Status
- Analyzed
- Assigner (CNA)
- GitHub_M
- Published
- Jul 10, 2026
- Last modified
- 2026-10-25 15:10 UTC
- Weaknesses
- CWE-287 · Improper Authentication
Affected Products
As published by the CNA in the CVE record.
rabbitmqrabbitmq-server4 version ranges
- >= 4.2.0, < 4.2.6
- >= 4.1.0, < 4.1.11
- >= 4.0.0, < 4.0.21
- >= 3.13.0, < 3.13.15
References
- github.com https://github.com/rabbitmq/rabbitmq-server/commit/7273c9eb6920abcde17b892dbe97ccaf906ead47
- github.com https://github.com/rabbitmq/rabbitmq-server/commit/9f8c39fcf0acbc43080ee7017a62a02832114112
- github.com https://github.com/rabbitmq/rabbitmq-server/pull/15936
- github.com https://github.com/rabbitmq/rabbitmq-server/pull/15940
- github.com https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.6
- github.com https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-36m6-588r-vqcw